The cost of organic food is higher than _____ of conventional food because the organic price tag reflects more closely the true cost of growing the food.
A new technique ____ out, the yields (收成) increased by 20% .
---What do you think of my suggestion? --- Sorry. What's that? I ____ about something else.
--- Haven't I told you that I like the beef well done? ---Yes, but I _____ it longer than I usually do.
I haven' t seen Mary these past few days. I m afraid she ____ herself for some time.
The truth, Sir, is that the old man____ across the street when my car hit him.